On Monday, President Obama gave an emotional speech to a Connecticut crowd on the importance of passing gun control legislation. This is part of a broader maneuver by the White House to use public support to pressure legislators for real action. And it’s working. Yesterday, Harry Reid announced that the first vote on meaningful gun legislation will happen Thursday.

Tonight Chris Hayes lays out his thesis for this noticeable shift leftwards in political deal making. But, is it a full-on sea change? Tune in to find out.